, also known as Kurushima Yoshita and , was a Japanese mathematician in the Edo period. The Japanese board game of shogi attracted Kurushima's interest; and he was recognized in his own time as a master player. Among shogi players, he continues today to be well known for seven "puzzle ring" gambits with subsequent sequenced maneuvers—including the "silver puzzle ring." In his lifetime, he was recognized among the most prominent intellectuals. His mathematical gift was highly esteemed. Kurushima, like most of his contemporaries, was very interested in the mathematical problems involved in "magic squares." Selected works Kurushima's published writings are few. OCLC 033747221 OCLC 033745707 OCLC 033746085 OCLC 033745451 See also Sangaku, the custom of presenting mathematical problems, carved in wood tablets, to the public in shinto shrines Soroban, a Japanese abacus Japanese mathematics Notes References Endō Toshisada (1896). . Tōkyō: _. OCLC 122770600 Selin, Helaine. (1997). Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Dordrecht: Kluwer/Springer. ; OCLC 186451909 David Eugene Smith and Yoshio Mikami. (1914). A History of Japanese Mathematics. Chicago: Open Court Publishing. OCLC 1515528 -- note alternate online, full-text copy at archive.org External links Shogi, Kuroshima's "Silver Puzzle Ring" gambit 18th-century Japanese mathematicians Year of birth unknown 1757 deaths Japanese writers of the Edo period